If you are getting "Unbound classpath container: JRE System Library [JavaSE-1.7] in project proj Build path Problem" in Markers Console in Eclipse when you create a new J2EE Dynamic web project, then the reason can be that JavaSE-1.7 classpath is not set or some other version of Java SE is available.
Solution to this Issue :- Right Click on your Project Folder,
- Properties → Java Build Path
- Goto Libraries tab and check if there is an error in JRE libraries.
- Click on Add Library and Select JRE System Library, click next
- Click on Installed JREs and add the JRE available (in my case I have JRE 8 installed). If you don't see any JREs here you are supposed to add one.
- Click OK and finish and the error must go!

JRE Build Path.png
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